Graphophone sound-box.



N0. 860,604. PATBNTBD JULY 10,1907.

' J. P. MURRAY.

GRAPHOPHONE SOUND B X. A APPLIOATION FILED rm. 1s. 1004. nmxnwnn Jun 24. 1007.

@11W/mko@ I. .w my. Qmihooeo Y r 95kt "3A tends the stylus lever` C. This block hasadepending l UNITED STATES PATENT OFFICE.

ioHN F. MURRAY, or LINDSEY, onIo.'

GRAPHOPHONE SOUND-BOX:

U To all whom it may concern:

Beit known that I, JOHN F. MURRAY, a citizen -oii in the county of have invented a new anddescribed, -particularly pointed out in the claim,

yand shown in the' accompanying drawings, in which, Figure l is a' perspective view of my improved attachment. Fig. 2 is r.plan view. Fig. 3 is a side elevation,v Fig. 4 is a vertical or longitudinalsection.

In'constructing my improvement I employ a metal reproducer or sound box A having a mica diaphragm B and the stylus lever C.- An interior annular shoulder is formed inthe sound box which is cylindrical in form and shoulder supports the mica disk B between two rubber packing by a split ring B2. :I am aware that this construction of diaphragm is old and do not claim same. The periphery or lim of the reproducer is cut away as shown at A on one side and in this cut out portionis arranged a metalblock C from the upper inner edge oi which exportion C2 vertically slotted and through the slot works a set screw C3 by means off'- which the block is held to the 'rim of the sound box A; and the slot permits the adjustment of the block vertically, with respect to the sound box thereby regulating the pressure'with which the arms oi the stylus lever bears on the diaphragm B. The stylus lever may be integral with or welded to the block, or otherwise secured and consists oi laterally extending arms projecting to each side of the block and at right angles to same, as shown at C4, the armsare then bent forward as shown at 0 5, tion C6 which is curved downward to the diaphragm. the lower ends of the curved portions being formed with A circular shoes bent parallel to the diaphragm and se- Speccation of Letters Patent. Application filed February l5, 1904, Serial No. 193,604.

rings B which are held in place' described. and have a reduced por :Patented `July' 16, 190'7. Renewed June 24, 1907. Serial No'. 380,645.-

cured tov same by means of a small amount of wax.l These lshoes C1 rest on the diaphragm `slightly to one side of the center of the diaphragm, the shoes being -arranged on opposite sides oi the center of the said diaphragm. v

The sound box A consists of the cylindrical ring-like portion A2 in which is held the diaphragm B, and this ring portion is connected to the cylindrical, tubular portion A4 by the .truncated conical portion A", this intermediate cone-shaped portion-forming a reservoir into which the sound waves produced by the vibrations of the diaphragm are collected and from which they pass into the contracted or tubular portion A4. It will be noted from Fig. 2 that the distance between the shoes C7 is equal to the diameter of the tubular portion A4 less the diameter oi the shoes. the outer end of the block C in which is placed the usual steel needle E held in place by a -set screw E in the usual manner. I

It will'be noted that while the arms of the stylus lever rest upon the diaphragm upon opposite sides of the center of the diaphragm and therefore contacts with it at two different points yetboth points or shoes oi the stylus lever are connected and integral with ,a common arm CL arranged as previously stated at right angles to the block and both shoes receive uniform impulses and reservoir C'collects and passes these vibrations into the tubular portion and a stronger and more natural tone is produced than by the usual construction.

Having thus fully described my invention whatI claim as new and desire to secure by Letters Patent is, In a device of the kind described, the combination with a sound box provided with a cut out portion in the rim, of a block arranged in said cut out portion, a vertcally forked depending portion extending from the' botto-.i of said block, a set screw on the periphery of said rim for engaging the fork, aI diaphragm` within the sound box, a U-shaped arm extending from the Vblock above said diaphragm downwardly curved portions upon the ends of the lshaped block, saidcurved portions terminating in dat shoes adapted to rest upon the diaphragm, for the purpose JNO. F. MURRAY.

Witnesses:

C. G. Bownns, I. N. Oi'nRMYnR.

produce synchronous vibrations. The conical shaped 

